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Dynamic pressure in the LHC: Influence of ions induced by ionization of residual gas by both the proton beam and the electron cloud

For the future HL-LHC or FCC study, the understanding of the beam interactions with the vacuum chamber is fundamental to provide solutions to mitigate the pressure rises induced by electronic, photonic and ionic molecular desorption. The proton beam circulating in the LHC vacuum chamber ionizes the...

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Detalles Bibliográficos
Autores principales: Bilgen, Suheyla, Baglin, Vincent, Bruni, Christelle, Mercier, Bruno, Sattonnay, Gaël
Lenguaje:eng
Publicado: 2019
Materias:
Acceso en línea:https://dx.doi.org/10.18429/JACoW-IPAC2019-TUPMP004
http://cds.cern.ch/record/2694243
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author Bilgen, Suheyla
Baglin, Vincent
Bruni, Christelle
Mercier, Bruno
Sattonnay, Gaël
author_facet Bilgen, Suheyla
Baglin, Vincent
Bruni, Christelle
Mercier, Bruno
Sattonnay, Gaël
author_sort Bilgen, Suheyla
collection CERN
description For the future HL-LHC or FCC study, the understanding of the beam interactions with the vacuum chamber is fundamental to provide solutions to mitigate the pressure rises induced by electronic, photonic and ionic molecular desorption. The proton beam circulating in the LHC vacuum chamber ionizes the residual gas producing electrons as well as positive ions. In-situ measurements were carried out, on the LHC Vacuum Pilot Sector during the LHC RUN II, to monitor the dynamic pressure, and to collect the electrical signals due to the electron cloud and to the ions interacting with the vacuum chamber walls. Experimental measurements of electrical signals recorded by copper electrodes were compared to calculations taking into account both the Secondary Electron Yield of copper and electron energy distribution. Finally, it seems that copper electrodes were not fully conditioned and an ion current could be estimated.
id oai-inspirehep.net-1745026
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2019
record_format invenio
spelling oai-inspirehep.net-17450262022-04-05T15:12:40Zdoi:10.18429/JACoW-IPAC2019-TUPMP004http://cds.cern.ch/record/2694243engBilgen, SuheylaBaglin, VincentBruni, ChristelleMercier, BrunoSattonnay, GaëlDynamic pressure in the LHC: Influence of ions induced by ionization of residual gas by both the proton beam and the electron cloudAccelerators and Storage RingsFor the future HL-LHC or FCC study, the understanding of the beam interactions with the vacuum chamber is fundamental to provide solutions to mitigate the pressure rises induced by electronic, photonic and ionic molecular desorption. The proton beam circulating in the LHC vacuum chamber ionizes the residual gas producing electrons as well as positive ions. In-situ measurements were carried out, on the LHC Vacuum Pilot Sector during the LHC RUN II, to monitor the dynamic pressure, and to collect the electrical signals due to the electron cloud and to the ions interacting with the vacuum chamber walls. Experimental measurements of electrical signals recorded by copper electrodes were compared to calculations taking into account both the Secondary Electron Yield of copper and electron energy distribution. Finally, it seems that copper electrodes were not fully conditioned and an ion current could be estimated.CERN-ACC-2019-169oai:inspirehep.net:17450262019
spellingShingle Accelerators and Storage Rings
Bilgen, Suheyla
Baglin, Vincent
Bruni, Christelle
Mercier, Bruno
Sattonnay, Gaël
Dynamic pressure in the LHC: Influence of ions induced by ionization of residual gas by both the proton beam and the electron cloud
title Dynamic pressure in the LHC: Influence of ions induced by ionization of residual gas by both the proton beam and the electron cloud
title_full Dynamic pressure in the LHC: Influence of ions induced by ionization of residual gas by both the proton beam and the electron cloud
title_fullStr Dynamic pressure in the LHC: Influence of ions induced by ionization of residual gas by both the proton beam and the electron cloud
title_full_unstemmed Dynamic pressure in the LHC: Influence of ions induced by ionization of residual gas by both the proton beam and the electron cloud
title_short Dynamic pressure in the LHC: Influence of ions induced by ionization of residual gas by both the proton beam and the electron cloud
title_sort dynamic pressure in the lhc: influence of ions induced by ionization of residual gas by both the proton beam and the electron cloud
topic Accelerators and Storage Rings
url https://dx.doi.org/10.18429/JACoW-IPAC2019-TUPMP004
http://cds.cern.ch/record/2694243
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AT brunichristelle dynamicpressureinthelhcinfluenceofionsinducedbyionizationofresidualgasbyboththeprotonbeamandtheelectroncloud
AT mercierbruno dynamicpressureinthelhcinfluenceofionsinducedbyionizationofresidualgasbyboththeprotonbeamandtheelectroncloud
AT sattonnaygael dynamicpressureinthelhcinfluenceofionsinducedbyionizationofresidualgasbyboththeprotonbeamandtheelectroncloud